EMAE 160 FINAL Questions - Lecture 6
(Metals and Heat Treating) Exam Q&A
15. Ferrous vs. Non-Ferrous - ANSWER-ferrous: has iron, easier to recycle,
magnetic, high tensile strength
nonferrous: does not have iron, non magnetic, higher conductivity, more resistant to
corrosion
16. What is tempering? - ANSWER-heating to a high temperature (less than the
melting temp) then cooling, to increase hardness and reduce brittleness
17. Why a controlled atmosphere box furnace for heat treating? - ANSWER-to
control carbon content
18. Electric arc vs. BOF/oxygen converter (for making steel) ? Select scrap. -
ANSWER-Electric arc: main input is scrap steel, make small amounts of specialty
and alloy steels, almost no pollution
BOF: main input is molten pig iron, make large amounts of standard steel, emits
pollution
1. Is it possible to heat treat/harden through low-carbon steels? Why or why not? -
ANSWER-No, only high carbon steels can be treated conventionally, heat treatment
done to low carbon steel only allows hardening at the heated surface where the high
carbon content is
2. The strength and hardness of steel increase as carbon content increases. (True or
False) - ANSWER-True
3. List three products produced on a rolling mill. - ANSWER-1. sheet
2. plate
3. slab
4. What element is the most important alloying ingredient in steel? - ANSWER-
carbon
5. Which quenching medium produces the most rapid cooling rate? - ANSWER-salt
water (brine > water > oil > air)
6. How is strength and hardness of steel related to the carbon content? - ANSWER-
higher carbon content is directly related to stronger and harder steel
7. Which alloying element is most commonly associated with stainless steels? -
ANSWER-chromium, prevents rust
8. Which metal has the lowest melting point? - ANSWER-mercury or gallium
(Metals and Heat Treating) Exam Q&A
15. Ferrous vs. Non-Ferrous - ANSWER-ferrous: has iron, easier to recycle,
magnetic, high tensile strength
nonferrous: does not have iron, non magnetic, higher conductivity, more resistant to
corrosion
16. What is tempering? - ANSWER-heating to a high temperature (less than the
melting temp) then cooling, to increase hardness and reduce brittleness
17. Why a controlled atmosphere box furnace for heat treating? - ANSWER-to
control carbon content
18. Electric arc vs. BOF/oxygen converter (for making steel) ? Select scrap. -
ANSWER-Electric arc: main input is scrap steel, make small amounts of specialty
and alloy steels, almost no pollution
BOF: main input is molten pig iron, make large amounts of standard steel, emits
pollution
1. Is it possible to heat treat/harden through low-carbon steels? Why or why not? -
ANSWER-No, only high carbon steels can be treated conventionally, heat treatment
done to low carbon steel only allows hardening at the heated surface where the high
carbon content is
2. The strength and hardness of steel increase as carbon content increases. (True or
False) - ANSWER-True
3. List three products produced on a rolling mill. - ANSWER-1. sheet
2. plate
3. slab
4. What element is the most important alloying ingredient in steel? - ANSWER-
carbon
5. Which quenching medium produces the most rapid cooling rate? - ANSWER-salt
water (brine > water > oil > air)
6. How is strength and hardness of steel related to the carbon content? - ANSWER-
higher carbon content is directly related to stronger and harder steel
7. Which alloying element is most commonly associated with stainless steels? -
ANSWER-chromium, prevents rust
8. Which metal has the lowest melting point? - ANSWER-mercury or gallium
